package org.example.lotterysystem.service.activitystatus.impl;

import org.example.lotterysystem.common.errorcode.ServiceErrorCodeConstants;
import org.example.lotterysystem.common.exception.ServiceExcetion;
import org.example.lotterysystem.service.ActivityService;
import org.example.lotterysystem.service.activitystatus.ActivityStatusManager;
import org.example.lotterysystem.service.activitystatus.operator.AbstractActivityOperator;
import org.example.lotterysystem.service.dto.ConvertActivityStatusDTO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

@Component
public class ActivityStatusManagerImpl implements ActivityStatusManager {
    private static final Logger logger = LoggerFactory.getLogger(ActivityStatusManagerImpl.class);

    @Autowired
    private final Map<String, AbstractActivityOperator> operatorMap = new HashMap<>();

    @Autowired
    private ActivityService activityService;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void handlerEvent(ConvertActivityStatusDTO convertActivityStatusDTO) {
        // 1、活动状态扭转有依赖性，导致代码可维护性差
        // 2、状态扭转条件可能会扩展，当前写法，扩展性差，维护性差

        if(CollectionUtils.isEmpty(operatorMap)){
        logger.warn("operatorMap为空！");
             return;
        }
        //map<String,AbstractActivityOperator>:
        Map<String,AbstractActivityOperator> currMap = new HashMap<>(operatorMap);
        Boolean update = false;
        //先处理：人员 奖品
        update = processConvertStatus(convertActivityStatusDTO,currMap,1);
        //后处理：活动
        update = processConvertStatus(convertActivityStatusDTO, currMap, 2) || update;
        //更新缓存
        if(update){
                activityService.cacheActivity(convertActivityStatusDTO.getActivityId());
        }
    }

    /**
     * 回滚扭转状态
     * @param convertActivityStatusDTO
     */
    @Override
    public void rollbackHandlerEvent(ConvertActivityStatusDTO convertActivityStatusDTO) {
        //operatorMap : 活动、奖品、人员
        //活动是否需要回滚？？        绝对需要
        //原因：奖品都恢复成INIT了       那么这个活动下的奖品绝对没抽完
        for(AbstractActivityOperator operator: operatorMap.values()){
            operator.convert(convertActivityStatusDTO);
        }
        //缓存更新
        activityService.cacheActivity(convertActivityStatusDTO.getActivityId());
    }

    /**
     * 扭转状态
     * @param convertActivityStatusDTO
     * @param currMap
     * @param sequence
     * @return
     */
    private Boolean processConvertStatus(ConvertActivityStatusDTO convertActivityStatusDTO,
                                         Map<String, AbstractActivityOperator> currMap,
                                         int sequence) {
        Boolean update = false;
        //遍历currMap
        Iterator<Map.Entry<String, AbstractActivityOperator>> iterator = currMap.entrySet().iterator();
        while(iterator.hasNext()){
            AbstractActivityOperator operator = iterator.next().getValue();
            //Operator是否需要转换
            if(operator.sequence() != sequence
              || !operator.needConvert(convertActivityStatusDTO)){
                     continue;
                  }
            //需要转换：转换
            if(!operator.convert(convertActivityStatusDTO)){
                logger.error("{}转换失败！",operator.getClass().getName());
                throw new ServiceExcetion(ServiceErrorCodeConstants.ACTIVITY_STATUS_CONVERT_ERROR);
            }
            //currMap删除当前Operator
            iterator.remove();
            update = true;
        }
        //返回
        return update;
    }
}
